Unit 2 Test Study Guide (Friction,Gravity and Newton's 1)
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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why is it easy to slip when there is water on the floor | there is less friction
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what factors impact the amount of friction between objects | the amount of force between the objects and the roughness of the surfaces
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a box being pushed across the floor (type of friction) | sliding
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a bird flying through the air air (type of friction) | sliding
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a book sitting on a table (type of friction) | static
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riding a skateboard (type of friction) | rolling
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which of following examples has the greatest amount of friction between the object | a box being pushed across the floor
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why must you exert a force to pick up an object ? what must you overcome | an object at rest tends to stay at rest
you must overcome gravity
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Law of Universal Gravitation | Gravitational force increases as mass increases Gravitational force decreases as distance increases
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weight | measurement of how hard gravity is pulling on that object
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mass | amount of matter in an object does not change based on location
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if earths mass doubled without changing its size, what would happen to your weight | your weight will double because of the increase in gravitational force
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how would the gravitational force between 1kg of lead and earth compare to the gravitational force between 1kg of marshall and Earth | the gravitational force would be equal because the masses are equal
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a penny is dropped from the top of a tall stairwell. what is the penny's velocity after it has fallen for 4s | 39.2
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terminal velocity | is the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity
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what is not projectile motion | swimming in a pool of water
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the acceleration of an object depends on the mass of the object and the amount of force applied | newton's 2
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whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first | newton's 3
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according to newton's 2 law how can you increase the acceleration of an object that is pushed by a force | reduce the mass or increase the force applied
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when you ride the bus, why do you fall forward if you are standing and the bus moving | when the bus stops your inertia hasn't been changed and you will continue in motion
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when a soccer ball is kicked, why don't the action and reaction forces cancel each other out | the forces act on opposite objects
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what would have to have to happen to the force applied if you wanted to accelerate two objects with different at the same rate | you would have to use a greater force with the larger object
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smileyk
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